A certificate of authenticity (COA) is a label to help you and your customers identify genuine Microsoft Windows software. Without it, your customers will not have a legal license to run their Windows software.

You will find the COA included in the System Builder Pack that you acquired from your distributor. If it is not included, contact your distributor.
You must affix the COA to the case of the computer on which you are preinstalling Windows as described in the system builder license.

Certificate Of Authenticity:

The picture above shows the look and feel of the COA used for Windows 8.1 Pro.

Similar to the Windows 7 & Windows 10 COA, it also includes security features to help prevent counterfeiting.

Recovery Media:

A recovery disc is any of various media containing a backup of the original factory condition or a favored condition of a computer as configured by an original equipment manufacturer or an end-user. OEM supplied recovery media are often shipped with computers to allow the user to reformat the hard drive and reinstall the operating system and pre-installed software as it was when it was shipped.

With OEM box, You'll also receive recovery disk, Which through you can reinstall your OS anytime, Given bellow;

Windows 8.1 Pro 64 bit OEM Box Distribution:

Individual OEM system builder Windows software licenses will be distributed with the following:

Certificate of authenticity (COA) label
Authorized recovery media
Documentation
Software License Terms

Note: The Software License Terms can typically be found within the software.

Place of Origin	USA
Brand Name	Microsoft
Model Number	Windows 8.1 Pro 64 bit OEM Box Package
Price	US$ 25
Packaging Details	Coa Stickers with DVD Media / Single User License
Delivery Time	3 to 5 Business Days After Payment
Payment Terms	Through Bank / TT / PayPal
Supply Ability	10,000 Pcs Monthly
Minimum Order Quantity	20 Pcs

We're Microsoft Product distributors & Wholesale Suppliers around the World, Our supply is also available for Windows 10 Pro License as well as COA Stickers in Bulk Quantity. Windows 8.1 Pro coa sticker wholesale suppliers, Windows product key sticker wholesale suppliers, Windows 8.1 pro oem product key sticker, Windows 8.1 Professional product key Labels are also available at reasonable cost.